Republicans will make critical choices next month about nominees they think can take back the three Virginia congressional seats lost to the Democrats in 2008. The trick will be picking candidates conservative enough to draw tea party activists and still please moderate voters in November. Republicans are also trying to upset 14-term Rep. Rick Boucher in southwestern Virginia’s remote, coal-mining 9th District. In each race there’s a well-funded, well-connected establishment Republican with veteran advisers and strong organizations ready for brutal and expensive fall races.